does anyone know what this is?
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Junior User
Joined: Jan 2009
Posts: 88
Likes: 0
From: Phoenix Arizona
does anyone know what this is?
This is my 75 F-100 with a 360, it is on the fire wall right in the middle. There is one black wire going in the cab and one going with the rest of the wires in engine compartment, there was a single vacume line to it that I removed because I think the part is cracked. I assume it is some sort of switch but do I need it? It does not seem to effect anything.Thanks and I hope the picture comes through, I believe I finally figured it out.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
If it had a single vacuum line going to it, my guess would be an economy light switch. Some trucks had a light on the dash that lit up when vacuum dropped past a threshold, to warn you that you're getting sub-obtimal fuel mileage. That'd be my guess. I've never actually seen one (they are rare) so I can't tell from looking at it if it's the factory type or not.
Postmaster
Joined: Aug 2005
Posts: 2,760
Likes: 8
From: Gadsden Purchase
Mine had one of those on the firewall for its first year! :)
Doggone it was cool seeing the picture, TL...
...I plumb forgot what it looked like. LOL :)
The bulb was removed in the first 6 months or so? {shrug}
Can't remember how long I put up with it. ;)
The novelty of it wore off pretty dangged quick with it flashing
at me every time I tried to move the truck forward. The sorry
sucker couldn't move itself from a level spot without putting it
in 1st gear (grandma on a T18) or slipping the hell out of the
clutch in 2nd because of the EGR, smog cam and being too
lean in the low speed circuit plus it had idle limiter caps on the
mixture screws too. I soon heard you could pop those off and
shove 'em back on tho, adding a quarter to half turn richer in
the process. ;)
The rebuild with the new 252/252 Comp "Economy" cam did
more for the gas mileage than using electricity to light the light
bulb ever did. ;) ...and a couple other things.
Alvin in AZ
Doggone it was cool seeing the picture, TL...
...I plumb forgot what it looked like. LOL :)
The bulb was removed in the first 6 months or so? {shrug}
Can't remember how long I put up with it. ;)
The novelty of it wore off pretty dangged quick with it flashing
at me every time I tried to move the truck forward. The sorry
sucker couldn't move itself from a level spot without putting it
in 1st gear (grandma on a T18) or slipping the hell out of the
clutch in 2nd because of the EGR, smog cam and being too
lean in the low speed circuit plus it had idle limiter caps on the
mixture screws too. I soon heard you could pop those off and
shove 'em back on tho, adding a quarter to half turn richer in
the process. ;)
The rebuild with the new 252/252 Comp "Economy" cam did
more for the gas mileage than using electricity to light the light
bulb ever did. ;) ...and a couple other things.
Alvin in AZ
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Thread Starter
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Junior User
Joined: Jan 2009
Posts: 88
Likes: 0
From: Phoenix Arizona
Thanks guys, I do have the low fuel economy light and when I replaced all the lights on the instrument cluster I left that one out. I think I will leave it there for good luck and not attach the vacume to it.
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